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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1910970cbcd858508f88f323e9beac58f01b32146c4a6445073e14ee41ea6a' 
  AND token = 'aVMpWvegjG8EdNTbGrkp12ZFm5BstFb36WNUYOjqIdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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