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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e22933e02f5000f0696c988dabb9293885bb3aa5b1b598a1b1349871b26212a2' 
  AND token = 'uBKWPS4gowRCiUDCfsUk6cf1j50awCgNb0pHAD8yhL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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