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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bbea593c8c5a5816f4d500a28cfdf445230abd1e96959e235526c830e938af' 
  AND token = 'jXUzl71BhfQCWqqe0pZc3B9NH6Pbn/pStIb1nJ5pzFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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