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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce7c9876a4e47ee5bab6dcbb7b87790ac9322bff4d3e919ce86045703555658' 
  AND token = 'mnov7TuztsWLictCSSlW5i3CUnWbDY4k7kgrG+GTxDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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