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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d60f067c54f18e94b84c8e8c4b295ee78ad9130d6db0956e57e405f6da8eba' 
  AND token = '0xjLz0TYk10KYYEu7MB9leElB2iQrOy3naDOBw4z+sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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