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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d77a29af21b10129c015ef752c58d6e179363c10629c3e8fbba9fbe67bfe5f3' 
  AND token = '4o/VQSxDKeVtpIMbjiTwY3mhcQPflfyKU3/fsOu0byg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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