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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1026f8bd2a4165c84a67c9b76af46036076eeb7d7d99052c3eb3b571980ef39' 
  AND token = '1mB7XbDoyMiIv7L1rjD6FagV9xVkpg559sd506OH8ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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