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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2610701c1b46d8bfb30136ce4ad54f17d5c80eb522b212f0c78a4cb8ad76c9' 
  AND token = 'gKf45dorKSNHI65jmlVcGGNg5wInanVQKKp9VC9yjEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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