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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b22c55bdf95b9cc1ee1681c60e37cb9fe6ef1bd16fd3d36b3e4a476cbf9e5e8' 
  AND token = 'Qsxo3xPKo+t6JjDrBfe3nKc6dH/fppw3jQQUgIKRj2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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