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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c6ffee630ac9a34fad6673497e3b2661dcaa80cff954e3781282f69634fb0f' 
  AND token = 'EWDAJYTIFgbvSvt9Ar2/chV7J4ab8nsHycW4IriTpss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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