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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4a6c58bc0c0c7ba4f8faf77fe7e615e5f6c26f3e0acc392d8947fbe29150c5' 
  AND token = 'YKOKmnLJ7kNLJ28P8EAViSnwi5yDW5pMZlgTgdI8Qqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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