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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb929227c6924e7a7034ef665584de997adcdf140ff6024b335ba2b23ab9803d' 
  AND token = 'x++Isy3ICzqNQ2eHTCfvSF4Wy34+FjJ1+mAwQOhVi4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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