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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6aaafbfe0cd1abcfe7459ebfbca0053431269e5fe22e00ea170887552d54b5' 
  AND token = '0KrTwX0wbygiIdh/Sl0falJUu1eUI4Il633K6jwzrJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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