SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5819ac99a5cc72ff042f800136db401cbeed902d5176551cf9d82a801d7541a0' 
  AND token = 'BvpgwvrotWwxYQBM3I5D0Q3AwH+l/5IAz4wVXqqFdjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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