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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61f8c6fff33f1db25a06fa6725aa5c09ef4ffd11568e523863d1bc3db6fd6d2' 
  AND token = 'rCoUTH9ikOYpj7mANLmtukjf/4iKPeJpSKvgrhL69/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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