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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c650a7be060b46dfaa0d2cad89cc037200e254bb304a02097341fdcbaaea82' 
  AND token = 'ocT4F6ItMg0F1yVHrxzpY12ErtSo91XW9TEO/girlXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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