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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a1d70a3e99b564a48cb654e2ee79904beb59cccfa7a28879a543e6120f4d91' 
  AND token = 'MUOkIXH9t77fsnbQHi08uYZZZQOu6wmXTgrqkp4tzi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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