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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a208d9dd5c156841f3ae2e71a23d728a4ba7f56a5aa6bc25f83d7a9c0b2ce8bf' 
  AND token = 'sNTcHfooyqWnYmXdHkLqZLuoJsPabuuduG2LseQlQmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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