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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d4b5ca0a29fd5f5479180d5d1a44d8bcda626e350977a484c87bee7d3d36fc' 
  AND token = 'ASgCFAUgmNdwrAVbusYEET3q+gP+9Rb5J+Qu99+GM+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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