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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd58eff8108f326841e3b430b346324b00fc4b2bc992baeb356b360517b85dae' 
  AND token = 'b2SOAmR1+XrbvUSam7RiCibuOKgGz/5JiTdH8e8VSS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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