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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e2627a7f14950fe3e119ae4033d5f07886486a7bb69d07abe8f10fa9952325' 
  AND token = 'ubmDKGN+h3P0MtjhzTMt1g5Eq+MitrBcutEcGOxEKpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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