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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf2f5408761dfa28d81426384742bc376b9190341c8ebe660120fead8140671' 
  AND token = '/Jj5RS0nx+SpyUCwidbdUOZqeoW4pksOhthA2KNTTkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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