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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9717e66c5cee636f73e9412cda6d8442c1089d06370f276022c4aeb3eb1466fc' 
  AND token = 'T8JdabJv+2iEavV7q81kLRzN5IK2Gyfz40cPoQhrTdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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