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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7bb3baf33c32df985f8c27dde5342c8a1a9b9db320e515c4e9ed04e162efd9' 
  AND token = '5QGRz/ikfFreD8eaRdiBMCubebbZkqPsB9CF1MB79pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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