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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341c9484983d56b25c0ecd75af12efc00ef2671d5daec8498b7d002f0268b7d7' 
  AND token = 'vRod10zcTJ91yTTDtymgRiZKTpgF9LHEX++acGsN2sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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