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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb37e9776bf6cc6d4c3b73cd050e1b24a717a173ea92e7a86a378f3101b319b' 
  AND token = 'Wu0uNzW31I6xOE9sA7ifxfX9k1Q0MhjU3LJtTuWHgpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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