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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3b5b211feccd01316109f1860b4705f7136226cccd74db3d862cd2765bc51c' 
  AND token = 'KyyBpDkObm7G3faybGSeftWGYtxJ+FThiZonY18YsVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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