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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92738646c3d7e9daf2fc0cc7533bec20a9858ae3de99b243bf4a09d1eca0fd67' 
  AND token = '2mpMq9Kyo0ifzjLujsgki7nww5mgbH5wUhcts0okyBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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