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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f47f29e8c6bf9d39ced5a625e48364ce703a29f464fc067b7d561313ebf349d' 
  AND token = 'I48jAe4ZSyKmkvyKn8X5PdOd8bm3ub91vrVm4HN+T5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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