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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691cd938855474d5f8a4794ba1d93300478d142a0d3361c3ad2416070b2714dc' 
  AND token = 'tPKaIgopaTns5PWFuIMAa4i6FNF2KLdCSDN9KKWqQYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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