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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b24cc1cb0af6471b53a2e1095dc2b2ab2caca8a0a7a8d31a4f353e0a5cfcba7' 
  AND token = 'psxUURDaXy+eMK4gGpES1dTYx5cDvWMUlkCPdhzJuTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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