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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f7178d467762877f59553b60877c6b6fae5a905085f16a10b92cee280be3f8' 
  AND token = 'NPHEcKQR85d9ysaj4MjcG+yX80zy1sItLHc40mugurU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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