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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d06688bc8c28d7001ceaefa5271e5d21f5e2362b2a65dfe9eb8ab5c78002b31' 
  AND token = 'YRWAoZwvShUQ7Btd1efRbjZ5xIf+00Fp6XC6RgOd6A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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