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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad34fe819444948376b25d08154745d643be2aacc53eab210416523593c4de4' 
  AND token = 'xOj90w1dFi67XRX8gHpdxrf0n7mAPp+VMz9G8maYlQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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