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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b79462e06b46a27ba5c24665e53c39fd123e62b5d4b66bc7b4a921520aa2a17' 
  AND token = 'K3FC2xPWNHLcgzc8JlJl9QRQnMPbLObP0t55nO6X4SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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