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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624c50d66788f959f45d5c16d2aad28f5bb797bc7859e179e8d75a2cb674406a' 
  AND token = 'nTreNgA031IE6owddIKhuRjCKCo4/K12w8MOH0/iP4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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