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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76f79fe7b01e916614ef1b7550ebcb532f97c2eb750cd610873638c9ea744ee' 
  AND token = 'W3FKiQqyL8Iiym0wxgpuz3CbrXR4cJSSVYLWbbv47MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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