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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8059984222ce9c4a40417eaf1e23e6c07d080eb6c9110e6ac0b616804d836bc2' 
  AND token = 'n8+jeG/f1FqHBUChdvo1rNGVjcHyNwjXQKWp20NAD9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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