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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f44ecadc02a4cea8b53c107adff3d33741a15cc0189630da3c70f306b1aff0' 
  AND token = 'uz/PUgAnIjX6qZUExmqXBfyW2HUh24cKUrwXpWilXQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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