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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfce5de9b0ef9dbc95db1d842a4deb94bb36176afcb7c59f38d2ab34c4145a1d' 
  AND token = 'QgizSDEB6juD4dyDPt2oRNeQsgmTVUtiEtKuLrl/Bp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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