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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2750390088523107cbf3790a2ac0318eefe0a46e8152ba5f5aa38bb40a8f25' 
  AND token = '6wXkJHdE9c1gw3Wi67M8bTyjL8X40G8Ri2aB2aNTJAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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