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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e31e5696a0bfd30974642290b636591cc14887aa6acf10030a7d343c26f50ac' 
  AND token = 'QLygJFSqz+YjR26DpCO3m7VW594aFNObthWth+UHgJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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