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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542167547475a59e0f5ce63b138a57cac9601ea1e0417fb57b5d1c144fe2252e' 
  AND token = 'eYgvd3MTYnvaKnoZuhqh/DRnKT1Utqf/UsbLzScSpsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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