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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19019767bc74a0ecf3d4b8c0bf3bb3c748727c97f99b7cabc69b8725b5e73e20' 
  AND token = 'shnO5jfOHbv92RlOGtZ8DPBaRELRi+et9zVMuzpMraQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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