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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a062972d2681ce64b4dce5982b476976ae196efdb0e51dbf103351acb32f8c' 
  AND token = 'pwYnnJIKgv0Nm13d3GknIMThgEyHcUa1S0FC7iBoiWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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