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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c815485187e559bc3374155bdb1a563e72453d6b50e0ac6f72424c0643d57dff' 
  AND token = 'XJDvRu5BUuSU94QvffD+hIPWMYbm5RdL0DgW5glQYjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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