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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ada21f51eebd4841dce11e4f16df31a68f1103f18ea41df0f83d1cae3d7ae1' 
  AND token = 'Dy9qI9F0Bevh3Kgh9EwqkhZVbjN2r+YkN7de5RDPw7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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