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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ca3773198a2db95450199f8df07009fe576b4405e47e02d60928cf08f182e7' 
  AND token = '1SlI+dZedP6/VwZp4Id8ofbmbFQNUII/Eq3UI7oNEbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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