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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25d0402efe46711fb906f58aed553f9dec5bf902de7409ed9b023e9b6a22ba7' 
  AND token = '4yDZ27G7snBJ2bgkObtvx22tJWVmokoYfFB2LmUO8zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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