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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5381656eff0650f013b7e6fa82632bad4194c6ea5ffdea2dd4e0dfd073cc0a2' 
  AND token = 'lIsF+lA6abPOzfxQUi7BeH/OXCK+ZWu7x4FAgqXEMNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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