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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3167cc7f2beab1ea7ec6da844153693d39913e213691bc705212eadcc695f70' 
  AND token = 'oIWjGV4mekP+0oU06V7h50+B2sGmMPf6ob5/m5YrCuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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