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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49afb092f07ce7ec986497296cde53c8847c31f4f4691fd18b623aae894198f' 
  AND token = 'Bc1wfeyCTypyI4offNqBTRsjLttPU7FxsvzCzBsydG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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