SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0fc117ad86d26ba7948df2050519178e235e1ee2f837c8c0197dd814a5db39' 
  AND token = 'yKIhWcupf8fYsckJEAGtMBAnQCZTbD6YwHxiKOtG+rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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