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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d2b6e1a803b736e166fbedb4584c19fb3b18d894d4a8df1dd79b40ae18cd49' 
  AND token = '2hbE4IVcYdMPXlDUoQA+VOWsKHU7evpzEPreAtiv2sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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