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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09018b4e78079ea44b28aefaf2d7115d29af51b7c377192d2092f678c8b79290' 
  AND token = 'HZpFG47a+do9JdUCj3D1k962jGdhwQ349hHU/kOg/Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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