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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6054b8f8fe0980c3eef6df38d70f60c2d84c9e029efd33c9a94dbcb3db570e3' 
  AND token = 'WuEHhiYEZ6rjuEi3jo6KzxSm/jggqeC+/B74R+h0MOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}