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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b90fe07c10822b60fe5d94a7a8ef4981377d0462d91434c19462551cd860ac' 
  AND token = '8QAz3dC7zRCF17X2svJD96zFriatobDQkUcPg1aW9OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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