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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02538a68c58ae285f362c8fe553e62da46693bb4ffff9120927e1286d59f9b33' 
  AND token = 'Y4EnXnizuKjxy6E2c9p63erRrj4ybG3W8gmM8yzU058=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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