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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3eea5e18e9bac601198299352590abcc104aa27631035a0c050a50d7e2e843d' 
  AND token = 'h9iIBs++p1wcQDfT0DYONeeljdIbQCw2JeI5z9V0ARo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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